Cardiac Calculations

Cardiac CalculationsLancashire & South Cumbria Cardiac NetworkLauren ButlerObjective The major objective of haemodynamicmonitoring is to evaluate the performance of the heart as a pump A number of haemodynamic parameters can be calculated from the pressure data and Cardiac output determinations These derived parameters serve as a basis for further evaluation of Cardiac performanceCardiac output For calculating Cardiac output the Fickmethod is the most simple It depends upon the principle that, the rate at which oxygen is consumed is divided by the quantity of oxygen removed from the blood by the body The result is the quantity of blood in which the oxygen was contained Cardiac OUTPUT (CO) = Oxygen consumption Arterial Venous Oxygen differenceThe normal Cardiac Output :5 6 litres/minCardiac OutputCardiac Index Cardiac output varies from person to person depending on specific variables major variable is body size A Cardiac output of 4 l/min may be considered normal for a petite woman but could be inadequate for a large man For this reason Cardiac output data are often normalised.

Cardiac output For calculating cardiac output the Fick method is the most simple It depends upon the principle that, the rate at which oxygen is consumed is divided by the quantity of oxygen

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